Automatic gas cut-off.



B. PRIEDMAN.

AUTOMATIC GAS GUT-OFF. APPLICATION FILED Nov.14, 1913.

.1,1 29,475. Patented Feb. 23, 1915.

2 SHEETS-SHEET 1.

EVT

B. FRIEDMAN.

AUTOMATIC GAS GUT-OFF.

APPLICATION FILED Nov.14, 1913.

Patented Feb. 23, 1915.

2 SHEETS-SHEET 21 UNITED STATES PATENT GFFICE.

BERNARD FRIEDMAN, 0F TRENTON, NEW JERSEY, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, 0F ONE-SIXTH T0 WILLIAM S. SPIVACK, ONE-SIXTH TO RICHARD KRAMAROFF, ONE-SIXTH 'IO NATHAN KRAMAROFF, AND ONE-HALF T0 ABRAHAM AUTOMATIC GAS CUT-OFF.

Specification of Letters Patent.

Patented Feb. 23, 1915.

Application led November 14, 1913. Serial N o. 800,899.

To all 'whom 'it may concern Be it known that I, BERNARD FRIEDMAN, a subject of the Czar of Russia, residing at Trenton, in the county of Mercer, State of New Jersey, have invented certain new and useful Improvements in Automatic Gas Cut- Offs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in .the art to which it appertains to make and use the same.

This invention relates to automatic gas cut offs.

The object of the invention resides in the provision of a gas cut of adapted for use in connection with a gas burner of any type and which will be automatically operated to cut off the flow of gas in the event the flame of the burner should be extinguished previous to cutting oli'l the gas.

A further object of the invention resides in the provision of an automatic gas cut ofi' which will be simple in construction, eiiicient and reliable in use, and which may be manufactured and installed at a comparatively small cost.

With the above and other objects in view the invention consists in the details of construction and in the arrangement and combination of parts to be hereinafter lmore fully described and particularly pointed out in the appended claim.

In describing the invention in detail reference will be had to the accompanying drawings wherein like characters of reference denote corresponding parts in the several views, and in which- Figure 1 is a side elevation of a gas burner equipped with the improved automatic cut oil", the parts of the cut olf being shown in the position they would occupy before lighting the burner; Fig. 2, a view similar to Fig. 1 showing the position of the parts after the burner has been lighted a predetermined time; Fig. 3. a plan view of what is shown in Fig. 1; Fig. 4, a section on the line 4 4 of Fig. 1; Fig. 5, a view looking at the left hand side of Fig. 1; Fig. 6, a side elevation of a modified form of the invention with the parts in the position they would occupy before the burner is lighted; Fig. 7, a view similar to Fig. 6 with Referring to the drawing A indicates anl illuminating gas burner which comprises a tubular body portion 10 and a tip 11. The

lflow of gas through the bore of the body portion 10 to the tip 11 is controlled by a valve 12 mounted in the body 10 and having an extended stem 13. Also mounted in the bore of the body 10 is the usual guard 14 which serves to regulate and properly deliver the gas to the tip 11. Mounted upon the body 1.0 is a bracket 15 having an approximately U-shape vportion 15. Secured to one end of the U-shaped portion of the bracket 15 in a iXed manner isfthe terminal of a tubular expansion bar 16. Pivotally secured to the other end of the portion 15 is an arm 17 and the upper end of this arm is in turn pivotally connected to the adiacent end of the expansion bar 16. By this construction the expansion bar 16 is supported in position to be subjected to the heat' of the flame when the burner is lighted but not to interfere withthe illuminating qualities vof the flame. Mounted in the lower end of the arm 17 is a set screw 18 for a purpose that will presently appear. Mounted in the eX- tension 13 of the valve 12 transversely of said extension is an arm 19 which has the end thereof adiacent the set screw 18 beveled as at 2O for coperation with said set screw as will presently appear. The end of the arm 19 remote from the set screw 18 has secured thereto one end of a spring 21, the other end of this spring being suitably anchored to the lower end of the bracket 15. By this instruction it will be apparent that the spring 21 constantly tends to hold the valve 12 in closed position.

In the operation of the device it will be apparent that when the burner is unlighted the parts will be disposed in the position shown in Fig. 1. If it is desired to light the burner it is only necessary to rotate the valve 12 to open position through the medium of a pull chain 22 secured to the end of the arm 1 9. remote from the screw 18. The burner is then lighted and the valve 12 still held in open position by means of the chain 22. rlhe heat ofthe llame Will then rapidly eXpand'the bar 16 longitudinally with the result that the arm 17 is rocked on its pivot and the screw 18 moved into engagement With the beveled end 20 of the arm 19 thus locking the valve 12 in open position against the influence ot' the spring- 21. Should the flame of the burner be extinguished from any cause the bar 16 Will rapidly contract and rock the arm 17 on its pivot in a direction to disengage the screw 18 from the end of the'arm 19 when the spring 21 will immediately act' to close the valve 12 and s hvutgotl'l thelow of gas.

In the modifiedl form of the invention shown in Figs. 6, 7 and S the arm 17 is provided Witha lateral extension 23. Pivoted to the central portion of the portion 15 is one end of an arm 24 the free end of' vvhich isadapted for cooperation with the adjacent end of the arm 19 which is beveled as at 26.

ln the operation of the modified form of the invention it will be apparent that when the valve 12 is opened by pulling down on the chain 22 the free end of the arm 211 will engage over the adjacent end" of the arm 19 and thus lock the valve against movement to closedl position. As soon as the burner is lighted the bar 16 will expand and rock the arm 17 on its pivot so that the extension 23 Will engage and move the arm 24; out of engagement With the arm 19- and at the same time move the screw 18 into engagement With the arm 19 whereby the valve 12 is still held in open position by the screw 18. Upon the flame of the burner being extinguished the various parts Will return to the position shown in Fig. 6 as will be obvious thus automatically cutting o; the 110W of gas.

It Will be noted that the bracket 15 consists of alined ring portions 27 and 28 Which are mutually connected by a bar 29.- These ring portions are disposed in embracing relation to the burner and the bar 29 is eX- tended to form the U-shaped portion l5.

`What is claimed is z- In an automatic gas cut ott", the combination oit' a burner, a valve carried by the burner for controlling the flow of gas therethrough, a cross arm carried by said valve, spring means constantly tending to move said valve to closed position, a framemounted on the burner, an expansion bar having one end pivoted to the frame, an arm pivoted to the trame having a centraly curved portion directed toward the burner, a V- shaped member having one arm pivoted on the 'frame and the end of said arm pivotally connected to the other end oi' said expansion bar, the apex of said member being adapted when the member is moved under the influence of the expansion bar to engage the central curved portion of the first named arm and disengage the latter from the cross arm of the valve, and a set screw carried by the other arm of the il-shaped member adapted to engage the adjacent end of the cross arm to lock the valve opened upon eX- pansion oi' said bar and to move out of engagement with said cross arm upon contraction of the bar to release the valve Jfor movement to closed position.

1n testimony whereof, l aiiix my signature, in the presence of two Witnesses.

BERNARD FRIEDMAN.

VVitness-es:

W7. HEADDEN, HARRY BnAsKnR.

Copies of this patent may be obtained for ve cents each, by adressing the Commissioner of Patents,

Washington, D. C. 

